[Usenet, IRC] Pornography. Originally this referred only to
Internet porn but since then it has expanded to refer to just about any
kind. The term comes from the warez kiddies
tendency to replace letters with numbers. At some point on IRC someone
mistyped, swapping the middle two characters, and the name stuck. It then
propagated over into mainstream hacker usage. New versions of the Mozilla
web browser internally refer to the image library as
“libpr0n”. Compare filk,
grilf, hing and
newsfroup.